This really is getting quite annoying. Like other said, it extends to at least both the armory officers and biochemists. You can see exactly which ones are problematic by going to the exchange and seeing which duplicate names keep appearing near the bottom of the prices. Medical and Security DOFFs are rare enough from there being relatively few categories within each, but this just exacerbates things, and I'm sure that at least a few people post their tac/sci DOFFs at prices just barely below the real sec/med ones in the hopes of tricking people into buying them without looking.